A Military Honor Guard marches in the Presidential Inaugural Parade down Pennsylvania Avenue after US President Barack Obama was sworn in for a second term as the 44th President of the United States in Washington, DC. More pictures of President Obama's inauguration. Photograph: Erik S. Lesser/EPA

A Los Angeles County Sheriff's volunteer catalogues guns being traded in at the "Gifts for Guns" in Compton, California. People can trade in their guns anonymously in exchange for $200 gift cards for assault weapons, $100 gift cards for shotguns, handguns and rifles, and $50 for non-operational firearms. Photograph: David Mcnew/Reuters

Andy Murray of Great Britain signs autographs after winning his fourth round match against Gilles Simon of France during day eight of the 2013 Australian Open at Melbourne Park in Melbourne, Australia. Photograph: Lucas Dawson/Getty Images

People protest in front of toys representing young victims of violent crimes in Rio de Janeiro, Brazil. The homicide rate for Brazilian young people under age 19 shot up 346 percent over the past three decades, according to research published in 2012 by the Latin American School of Social Sciences. Photograph: Silvia Izquierdo/AP

A woman inspects a poultry farm in the outskirts of Managua city. Nicaragua's Ministry of Agriculture and Forestry (MAG-FOR) announced that the country has strengthened surveillance and launched a training program, due to the recent outbreak of avian influenza virus of the type H7N3, reported in the state of Aguascalientes in Mexico. Photograph: Oswaldo Rivas/Reuters

People take part in the traditional festival of "Correfoc" in Palma de Mallorca. Participants dress as demons and devils and move through the streets scaring people with fire and fireworks. Photograph: Jaime Reina/AFP/Getty Images

Prince Harry or just plain Captain Wales as he is known in the British Army, wears his monocle gun sight as he sits in the front seat of his cockpit where he is serving as an Apache Helicopter Pilot/Gunner with 662 Sqd Army Air Corps, at the British controlled flight-line in Camp Bastion southern Afghanistan. More pictures of Prince Harry Photo: John Stilwell/PA

Ethiopia supporters react after Adane Girma scored the equalizing goal against Zambia during their African Cup of Nations group C match at the Mbombela stadium in Nelspruit, South Africa. The game ended in a 1-1 draw. Photograph: Armando Franca/AP

A Tourist dressed up in a ballet outfit poses for photos while in the background on a Jumbotron in Times Square in New York as US President Barack Obama prepares to speak to the crowd after he takes the oath of office during the 57th Presidential Inauguration ceremonial swearing-in at the US Capitol in Washington, DC. Photograph: Timothy A.Clary/AFP/Getty Images

Riot police put their masks as Turks stage a protest against NATO's deployment of German Patriot Missile Defense System to protect Turkey in case neighboring Syria launches an attack, in the Mediterranean city of Iskenderun, Turkey. Photograph: Burhan Ozbilici/AP

People gather as Malian soldiers arrive in the city of Diabaly. French and Malian troops today recaptured the Malian towns of Diabaly and Douentza from Islamist fighters. Photograph: Issouf Sanogo/AFP/Getty Images

Ethiopian soccer fans celebrate a goal during their African Cup of Nations Group C soccer match against Zambia at Mbombela Stadium in Nelspruit, South Africa this afternoon. Photograph: Themba Hadebe/AP

Tempus fugit: a Montblanc watch goes on display on the opening day of the Salon International de la Haute Horlogerie watchmaking fair in Geneva, Switzerland. Photograph: Fabrice Coffrini/AFP/Getty Images

Models walk the rather bizarre-looking runway for Belgian designer Raf Simons. The show is part of his haute couture spring-summer 2013 collection for the house of Dior in Paris. Photograph: Benoit Tessier/Reuters

Serena Chen of Polytron technologies displays the prototype of a transparent mobile phone in Taoyuan City, northern Taiwan. The company hopes the near-invisible (and somewhat pointless) device will be on the market by the end of the year. Photograph: David Chang/EPA

It's not just nice for penguins: pupils from Darul Uloom Islamic school in Holcombe on the Lancashire/Greater Manchester border play in the snow.More than 100 schools in Lancashire were closed today after heavy snowfall overnight. Photographs: Christopher Thomond for the Guardian

Another activist, this time in Kiev, wears a banner with a portrait of jailed former Ukrainian prime minister Yulia Tymoshenko during a rally outside President Viktor Yanukovych's offices. Photograph: Sergei Supinsky/AFP/Getty

Nathalie Hynde, daughter of Pretenders singer Chrissie Hynde, protests in a treehouse. She is campaigning against plans to clear land to make way for the construction of a bypass in Combe Haven valley, Crowhurst, near Hastings. Photograph: Luke Macgregor/reuters

Barack Obama, arrives at St John's Church in Washington before the ceremonial swearing-in for his second term in office. Photograph: Nicholas Kamm/AFP/Getty ImagesMeanwhile spectators gather to witness the inauguration. Photograph: Eric Thayer/Reuters

Kabul security personnel are seen on the roof of the traffic police headquarters during a Taliban suicide attack in the Afghan capital. Nato troops were attacked with rockets and gunfire after insurgents stormed the building this morning. Photograph: Shah Marai/AFP/Getty Images

Residents wade through floodwaters in Jakarta, Indonesia. Flooding in the capital has claimed at least 20 lives, with most of the victims having drowned or been electrocuted. Photograph: Bagus Indahono/EPA

Women in Barberena cemetery, Guatemala City, carry the coffin of a woman who was found dead last week. Amnesty International claims one woman per day was killed in Guatemala last year. Photograph: Jorge Dan Lopez/Reuters

A group of contestants wait for a wave during the Mavericks Invitational surf competition in Half Moon Bay, California.Looks like they got what they were waiting for, too. Photographs: Stephen Lam/Reuters

Actor Darryl Hanah strums along as she watches Rami Jaffe, Jonny Kaplan, and Jessy Greene perform at the Eco Hideaway at the Chateaux during the 2013 Sundance film festival in Park City, Utah. Photograph: Danny Moloshok/Invision/AP